The PPP model should rely on local government credit. The government’s ability to pay for PPP projects depends not only on the current budgetary resources，but also on the long-term comprehensive financial resources based on land finance mainly. It is necessary to reduce the burden on PPP and form the investment and financing pattern of multiple synergies and symbiosis. The author suggests to normalize the PPP model of government purchasing services and abolish the one-size-fits-all limit on government payment. We will straighten out the user payment mechanism and actively carry forward the concession-based PPP model. Define the legal status of the LGFVs and grant them the core function of realizing the value of public resources. Carry out a comprehensive review of PPP related policies since 2013，and reconstruct the policy system and working mechanism of PPP model.